Mark Ruffalo accidentally live-streamed part of Thor: Ragnarok

Actor Mark Ruffalo, who has played Bruce Banner/the Incredible Hulk in a number of Marvel Cinematic Universe entries over the past few years, took to Instagram on Tuesday night to live-stream the Thor: Ragnarok red carpet event (via The Hollywood Reporter). Ruffalo introduced the Thor: Ragnarok screening by taking the stage to thunderous applause at the El Capitan Theatre, where he and his co-stars were announced via a recording of Jeff Goldbum dressed up as his character, the Grand Master. The Hulk actor pointed his phone at the audience to capture the moment, and those watching the livestream got a glimpse at the stars of the upcoming Taika Waititi-directed pic.

But what they weren't expecting to hear was a sizable portion of the film itself. That's right: Ruffalo accidentally left his livestream up after taking his seat in the theater, and kept it going as the movie started.

Though fans online notified him that he hadn't actually ended the stream and that his phone was still broadcasting, it continued. Laughter from the audience and the film's audio was heard in the livestream, which roughly 2,500 people were viewing while Ruffalo was in the theater. Eventually, Ruffalo stopped the broadcast, but the audio was quickly captured and uploaded to YouTube. The video has since been deleted from the site, however, on grounds of copyright infringement.

At the screening, phones were taken from patrons and placed into sealed bags, which were then returned to the screening's attendees once the film ended. This is a pretty standard practice for Disney screenings, both public and press-exclusive, that occur before a movie is officially released. Ruffalo didn't have to follow the policy since he's, well, in the actual film being screened and already knows everything that happens.

This isn't the first time Ruffalo has found himself in a sticky situation with Marvel Studios. During a past interview with Good Morning America (via ComicBook.com), Ruffalo accidentally revealed some secrets about Avengers: Infinity War that he definitely wasn't supposed to discuss.

"Let me just say this: Like every other Marvel movie, it doesn't end well for the superheroes. Wait until you see this next one. Everybody dies," said Ruffalo before backpedalling. "Not everybody, no. Can we rewind that part? Am I in trouble?"

Despite his slip-ups, things are looking great for the actor and his character. Ruffalo previously confirmed that Thor: Ragnarok is the first of a three-movie arc that Marvel Studios head Kevin Feige wanted to bring forth for the Hulk. He has mentioned that though the Hulk won't get his own standalone movie (with Ruffalo at the lead; Edward Norton already starred in Hulk solo pics in the past) due to licensing issues with Universal, he will have his own storylines in Thor: Ragnarok, Avengers: Infinity War, and Avengers 4.

"Kevin [Feige] pulled me aside before this, and said, 'If we were going to do a standalone Hulk movie, what would it be?" Ruffalo explained to CinemaBlend. "And I said, 'I think it should be this, this, this, and this and this, and ends up like this.' And he's like, 'I love that. Why don't we do that in the next three movies, starting with Thor 3 and then we go into Avengers 3 [Infinity War] and 4.' And I was like, 'That sounds great!' And so we are at the beginning of this arc."

According to those who viewed the leaked clip before it was taken down, the Hulk can't be heard, so it remains unclear just what the character's arc in Thor: Ragnarok will entail.

The upcoming film also features Chris Hemsworth as Thor, Tom Hiddleston as Loki, Anthony Hopkins as Odin, Cate Blanchett as Hela the Asgardian Goddess of Death, and Tess Thompson as Valkyrie. Here's the plot synopsis for Thor: Ragnarok: "The mighty Thor finds himself in a lethal gladiatorial contest against the Hulk, his former ally. Thor must fight for survival and race against time to prevent the all-powerful Hela from destroying his home and the Asgardian civilization."